Unfortunately, there are a couple of APIs I’m using which were only introduced in 10.6, plus Grand Central Dispatch. If you’re using Steam for playing games (as opposed to just chat), I would recommend upgrading to Snow Leopard for the graphics improvements that come with the 10.6.4 SLGU as well as any future graphics updates that come.

I’ve been using GridMount for awhile, but for some reason it can’t open .vpk files for me. They either show up completely blank or are filled with folders and files that are corrupted. Any help would be appreciated.

Do you have a specific VPK that isn’t working? From what I can tell, you need to mount the pakXX_dir VPK(s) (e.g. portal2/pak01_dir.vpk); without looking at the actual VPK file structure it seems to me to be a hybrid between GCFs and NCFs.

Just a note for all you Lion users out there. GridMount works, but the state of MacFUSE is, well, not so much. The last update for MacFUSE was in December 2008, which is before Mac OS X Snow Leopard was released. The MacFUSE project is considered to be dead, but there have been efforts to bring MacFUSE-like functionality to Lion. I would recommend OSXFUSE, which can be used as a replacement for MacFUSE.

Moving Gridmount to OSXFUSE is something I’ve wanted to do for a while now, but I haven’t had time to look into it yet. It looks like it has MacFUSE backwards compatibility, does Gridmount work with OSXFUSE out of the box?